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Ab-initio 6-3 lG* OH frequency calculations show the water molecule complex with the bridging OH group of zeolites to be hydrogen-bonded. The experimental 3390-and 3695-cm-I frequencies of the complex are interpreted to belong to the water OH group interacting with the surface by two hydrogen bonds and to the other slightly perturbed water OH group, respectively. The broad -2900-, -2450-, and -1700-cm-I bands are explained on the basis of a theory of OH band profiles of hydrogen-bonded complexes to be the so-called

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